Microstructural evolution in a spray-cast aluminum alloy during equal-channel angular pressing

Gao, Nong; Starink, M.J.; Furukawa, Mutsuhisa; Horita, Zenji; Xu, Cheng; Langdon, Terence G.

doi:10.1016/j.msea.2005.08.075

Cited by 26 publications

(16 citation statements)

References 25 publications

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“…New data was obtained by performing ECAP on Al-1050, Al-Zr and Al-Zr-Si-Fe alloys and HPT on Al-2024 and Al-3Mg-0.2Mn, TEM and SEM micrographs for several alloys processed by ECAP and HPT are presented in Figs 6-8. Grain size data for a range of other commercial and experimental alloys was obtained from [30,35,36,73,74,75,76,77,78]. The database contains a total of 21 alloys, in a total of 37 alloy-processing combinations, with strains ranging from 1 to 17 and with resulting grain sizes between 2 μm and 50 nm, the full database is presented at [79].…”

Section: Results and Analysis: Grain Size During Spdmentioning

confidence: 99%

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Predicting grain refinement by cold severe plastic deformation in alloys using volume averaged dislocation generation

et al. 2009

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The grain refinement during severe plastic deformation (SPD) is predicted using volume averaged amount of dislocations generated. The model incorporates a new expansion of a model for hardening in the parabolic hardening regime, in which the work hardening depends on the effective dislocation free path related to the presence of non shearable particles and solute-solute nearest neighbour interactions.These two mechanisms give rise to dislocation multiplication in the form of generation of geometrically necessary dislocations and dislocations induced by local bond energies. The model predicts the volume averaged amount of dislocations generated and considers that they distribute to create cell walls and move to existing cell walls/grain boundaries where they increase in the grain boundary misorientation. The model predicts grain sizes of Al alloys subjected to SPD over 2 orders of magnitude. The model correctly predicts the considerable influence of Mg content and content of nonshearable particles on the grain refinement during SPD.

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Section: Results and Analysis: Grain Size During Spdmentioning

confidence: 99%

“…and Al-2024 and selected microstructure analysis results on these alloys was reported before [33,34,35]. All SPD processing was carried out at room temperature, with the exception of ECAP on the Al-7034 alloy which was carried out at 200ºC.…”

Section: Experimental: Materials Processing and Microstructure Analymentioning

confidence: 99%

Predicting grain refinement by cold severe plastic deformation in alloys using volume averaged dislocation generation

et al. 2009

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“…46,47,48 Figure 6 shows that there are many similarities in the DSC curves for Al-2024 samples either annealed or processed by ECAP through different numbers of passes but these curves are significantly different from the curve obtained for the same alloy in the T351 condition. 47 A DSC analysis of the T351 sample shows there are three thermal reactions in the DSC curve and these are identified specifically as co-cluster dissolution (160-240°C) (I), S formation in the range of 240-300°C (II) and S dissolution in the range of 300-500°C (IV).…”

Section: Aluminiummentioning

confidence: 95%

Using differential scanning calorimetry as an analytical tool for ultrafine grained metals processed by severe plastic deformation

Gao

Starink

Langdon

2009

Materials Science and Technology

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Differential Scanning Calorimetry (DSC) is a thermal analysis technique that measures the energy absorbed or released by a sample as a function of temperature or time. Analysis by DSC has wide applications for examining solid-state reactions and solid-liquid reactions in many different materials. Quantitative analyses of the kinetics of reactions may be assessed by reviewing the interrelation between activation energy analysis methods. In recent years, DSC has been applied in the examination and analysis of bulk ultrafine-grained materials processed through the application of Severe Plastic Deformation (SPD). This overview examines these recent reports with reference to materials processed using the procedures of Equal-Channel Angular Pressing (ECAP), High-Pressure Torsion (HPT) and Accumulative Roll-Bonding (ARB). In addition, some critical issues related to DSC analysis are also discussed.

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“…The reason for this deviation is not clear but this is a heat-treatable alloy containing a high volume fraction of intermetallic particles having a range of sizes [23,24]. For comparison purposes, an Al-1050 (99.5% pure Al) aluminium billet was processed by ECAP at room temperature using an ECAP die with the same geometry.…”

Section: Factors Influencing the Deviation From The Ideal Angle And Tmentioning

confidence: 99%

Texture evolution by shear on two planes during ECAP of a high-strength aluminum alloy

et al. 2008

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The evolution of texture was examined during equal-channel angular pressing (ECAP) of an Al-Zn-Mg-Cu alloy having a strong initial texture. An analysis of the local texture using electron back-scatter diffraction demonstrates that shear occurs on two shear planes: the main shear plane (MSP) equivalent to the simple shear plane, and a secondary shear plane which is perpendicular to the MSP. Throughout most regions of the ECAP billet, the MSP is close to the intersection plane of the two channels but with a small (5˚) deviation. Only the {111}<110> and {001}<110> shear systems were activated and there was no experimental evidence for the existence of other shear systems. In a small region at the bottom edge of the billet that passed through the zone of intersection of the channels, the observed textures were fully consistent with the rolling textures of Copper and Goss.

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Microstructural evolution in a spray-cast aluminum alloy during equal-channel angular pressing

Cited by 26 publications

References 25 publications

Predicting grain refinement by cold severe plastic deformation in alloys using volume averaged dislocation generation

Predicting grain refinement by cold severe plastic deformation in alloys using volume averaged dislocation generation

Using differential scanning calorimetry as an analytical tool for ultrafine grained metals processed by severe plastic deformation

Texture evolution by shear on two planes during ECAP of a high-strength aluminum alloy

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